Originally Posted By alou:Is there such a thing as an ideal length for pistol caliber ARs? I was thinkng along the lines of maybe a 10 - 11 inch barrel for a .45 acp build. Do you guys forsee any problems with that? Thanks.

8.2gr of Win 540 (Hodgdon HS-6) and a 230gr LRN out of a 10.25" Uzi pipe will get you 1080fps.